Publication:
Second Best Efficiency in Auctions

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2008
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Abstract
We characterize the incentive compatible allocation that maximizes the expected social surplus in a single-unit sale when the efficient allocations is not implementable. This allocation may involve no selling when it is efficient to sell. We then show that the English auction always implements the second best allocation when there are only two bidders, but not with more than two. Our model employs a unidimensional type space with independent types and allocative externalities, but captures some features of models with multidimensional types.
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Efficiency, auctions, mechanism design
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